The Al₂O₃–HfO₂–Gd₂O₃ Phase Diagram.
II. Vertical Sections

Abstract

For more complete description of the Al₂O₃–HfO₂–Gd₂O₃ phase diagram, three vertical sections are constructed in a wide temperature and composition range. The Gd₂О₃ and HfO₂ corner bisectors explain the mechanisms of Gd₂О₃ phase transformations, С ⇆ Х ⇆ Н ⇆ А ⇆ B, and interaction in the HfO₂ corner of the system. The isopleth at 15% (mol.) HfO₂ (15H) shows the Al₂O₃–HfO₂–Gd₂O₃ constitution in Аl₂О₃- and Gd₂О₃-rich regions.